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- anonymous

a 4.0 pendulum's bob starts swinging from a height of 2.5m as per figure. Assume the friction and air resistance are negligible.

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- anonymous

What is the highest point it will reach at the end of the first swing?

- anonymous

at what point is its PE equal to its to KE?

- JamesJ

Where's the figure?

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- JamesJ

In this system, btw, energy is conserved.
Hence the bob at the end of the pendulum will stop at the same height, on both sides. If it didn't, and it stopped higher, energy was added; if it stopped lower, energy was lost.

- Mani_Jha

Let the height at which K.E And PE are equal be x.
P.E=mgx.
Total energy= mgh h=4(Conservation of energy)
Therefore, mgx=mgh/2
x=h/2

- Mani_Jha

sorry h=2.5 not 4

- JamesJ

No, that's not right. It's not that we must necessarily have 1/2 of the PE at the top of its swing.

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